package edu.gyc.test;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

public class SpinLockDemo {
    AtomicReference<Thread> atomicReference = new AtomicReference<>();

    public void myLock() {
        Thread thread=Thread.currentThread();
        System.out.println(Thread.currentThread().getName()+"\tcome in!");
        while (!atomicReference.compareAndSet(null, thread)) {

        }
    }

    public void myUnlock() {
        Thread thread=Thread.currentThread();
        atomicReference.compareAndSet(thread, null);
        System.out.println(Thread.currentThread().getName()+"\t invoked myUnlock!");
    }

    public static void main(String[] args) {
        SpinLockDemo spinLockDemo=new SpinLockDemo();
        new Thread(()->{
            spinLockDemo.myLock();
            try {
                TimeUnit.SECONDS.sleep(5);
            }catch (InterruptedException e){
                e.printStackTrace();
            }
            spinLockDemo.myUnlock();
        },"AA").start();

        try {
            TimeUnit.SECONDS.sleep(1);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        new Thread(()->{
            spinLockDemo.myLock();
            try {
                TimeUnit.SECONDS.sleep(1);
            }catch (InterruptedException e){
                e.printStackTrace();
            }
            spinLockDemo.myUnlock();
        },"BB").start();
    }
}
